2014 BMW i3 with a REx unit fitted will be the first car to qualify as a range-extended battery-electric vehicle or "BEVx." CARB describes this type of electric vehicle as "a relatively high-electric range battery-electric vehicle (BEV) to which an APU is added." The APU, which maintains battery charge at about 6% after the pack has been depleted in normal use, is strictly limited in the additional range it can provide. Other examples Other range-extended electric vehicles include the discontinued Cadillac ELR and the discontinued Fisker Karma. In June 2016, Nissan announced it will introduce a compact range extender car in Japan before March 2017. The series plug-in hybrid will use a new hybrid system, dubbed e-Power, which debuted with the Nissan Gripz concept crossover showcased at the 2015 Frankfurt Auto Show. The technology, without the plug-in ability, had been deployed to the Nissan Note e-Power and Nissan Kicks e-Power. The LEVC TX London taxi was launched in 2017 and features a 33 kWh battery that is charged by a 1.5-litre gasoline engine. The Lixiang One is a large SUV which combines a 41-kWh battery with a small 1.2-litre gasoline engine. This approach has also been used for heavy vehicles, such as Wrightbus's Gemini 2 and New Routemaster buses. Ford has patents for a bed mounted gasoline-powered generator for their fully electric pickups. Rivian has patents for bed mounted additional batteries for increased range. Rivian electric trucks can charge each other for extended range. Unmanned aerial vehicles The 2010 Wolverine 3 program included an ICE range extender for its unmanned aerial vehicle. Powertrain A range-extended electric vehicle uses a series hybrid drivetrain. See also Genset trailer Hybrid vehicle drivetrain Microturbines List of hybrid and plug-in hybrid vehicles References Vehicle technology Electric vehicles Plug-in hybrid vehicles